Physics, Chemistry and Biology: Post your doubts here!

[AYK998]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_31.pdf
question 6 part b 1

 

[ahmado]

what do u have?

varient 1 but need 2

 

[Phoenix Blood]

i dont think so everybody has them and they will have an unfair advantage on me

POINT! Then post it here so the whole of everyone has no unfair disadvantage (..seems like it includes me too...)

 

[Phoenix Blood]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_31.pdf
question 6 part b 1

120/2= 60Bq
60/2= 30Bq
30/2 = 15 Bq

We halved it thrice, thus (3* (1.4*10^10))

 

[ahmado]

so u have v 1 paper with u?

yeah

 

[AYK998]

thnx

 

[ahmado]

check ur email

nothng

 

[Fattoomi]

i know it is the right paper i have it. help me with paper 3 i have v2 and 3 but i need 1 [email protected]

pleaeese send me the papers my email [email protected]

 

[Fattoomi]

send em 2 me and i will send 1 when i get it
i will receive insha2alla 2day

pleaaase send me the papers my email [email protected]

 

[Fattoomi]

ok

 

[Gamedos]

check ur mail

please forward me the papers at [email protected]

 

[Fattoomi]

check ur mail

did u send the papers
i cant find them

 

[Phoenix Blood]

eureka!

Q) Explain why energy losses in the transmission cables are lower when the voltage is
high.


Ans) high voltage means) low(er) current (but V is directly prop. to R!)
for given supply power
(low(er) current means) less heat/thermal energy (generated in cables) OR P = I2R (?)
for given resistance (of cables)
cables heated by current

Explain...

 

[Awesome12]

eureka!

Q) Explain why energy losses in the transmission cables are lower when the voltage is
high.


Ans) high voltage means) low(er) current (but V is directly prop. to R!)
for given supply power
(low(er) current means) less heat/thermal energy (generated in cables) OR P = I2R (?)
for given resistance (of cables)
cables heated by current

Explain...

Well since voltage is inversely proportional to I, it will mean that a high voltage will cause a low current
Low current flow will cause less resistance in the cables as less heat is generated. Thus less power is lost

 

[silver_moon]

Please solve the first question

ur kiddin rit???which yr ppr iz it???cn u tll man...d ques wich uv posted..

 

[silver_moon]

i dnt thnk so its a school exam , dats why i asked
really curious to knw

did he reply 2 u sofi....ask him 4m wr he got d ppr!

 

[Phoenix Blood]

ur kiddin rit???which yr ppr iz it???cn u tll man...d ques wich uv posted..

Shock upon shock

 

[Phoenix Blood]

GUYS JUST STUDY! (...instead of here-there babble and time wastage)

 

[Awesome12]

For all those cheating or want to cheat, please do not cheat. You are merely destroying the efforts of all the other hard-working people. Even more important is the fact that cheating is Haram, it is mentioned in a Hadith;
'One who cheats is not amongst us'

 

[Phoenix Blood]

For all those cheating or want to cheat, please do not cheat. You are merely destroying the efforts of all the other hard-working people. Even more important is the fact that cheating is Haram, it is mentioned in a Hadith;
'One who cheats is not amongst us'

Won't measures be taken against cheating? It's not that easy, is it?